All indexes are illusions, but some illusions are useful where others are not.
Where do your variables come from? For example, how will you calculate your own real estate price variable for your index? Will you just take it from some other index? How will you decide what weight to use for each variable? And if you don't actually buy or sell any real estate (or in general, transact in any particular variable), will you omit it from your calculation that year, as having no impact?
And when you have performed all the calculations, and you end up with your own Quora Fea Index, to what end will you use it?
If your index shows that you are 2% poorer this year, what will you do in response? Be depressed? Work harder? Ask for a raise? Get a second job?
If your index shows that you are 25% richer this year, what will you do? Give away 25% of your savings? Buy a yacht? Work part time?
Seems like a waste of time to me, other than to humor yourself.